roll: third_party/pigweed 776a399..3be1c11 (3 commits)

3be1c11:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/290584 pw_sync: Add timed threaded testing
f4b9f07:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/300812 pw_multibuf: Use std::generate to create test data
a15096b:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/307953 pw_kernel: Turn panic_detector into a lib

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: 776a399e4e0576..3be1c116149fb2
Roll-Count: 1
Roller-URL: https://cr-buildbucket.appspot.com/build/8708406639957686049
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I00a9d1e0493bbc32632d160c5535e22d74c65381
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/307871
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index 776a399..3be1c11 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 776a399e4e057690144a619d5d65c1b1cb79e94a
+Subproject commit 3be1c116149fb281d5a8606b27ba4232ddcda174